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Lesson 10. Keying > Understanding Primatte

Understanding Primatte

In this lesson, we'll use Photron's Primatte chroma-keying system. To effectively use Primatte, you need to understand the application and how it works. Primatte constructs a space described by three concentric partial spheres. The space is created by finding color values in a 3D axis, with each axis being a primary color of red, green, or blue.

These three shells separate four zones. Zone 1 is the complete background image. Zone 2 is the foreground image with spill suppression and transparency. Zone 3 is the foreground image with spill suppression. Zone 4 is the complete foreground image, 100 percent opaque with no spill suppression. As you scrub on an image, Primatte pushes and pulls on the shells based on which function you use, creating dents and bumps on the shells. The position of the dents is determined by the pixel values as located on the RGB axis.


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